We develop and utilize various state-of-the-art ultrafast electronic and vibrational (micro)spectroscopic techniques to understand and unveil the underlying mechanisms of functional properties in semiconducting materials for their optoelectronic applications.

Photo credit: David Bain (in Andrew's group @ Cornell)

We aim to study photophysics and photochemistry of organic/inorganic semiconducting materials occurring from initial tens of femtosecond to nano/micro/millisecond time scales, covering diverse excited-state dynamics, such as charge generation, singlet fission, exciton/carrier diffusion, energy transfer, photocatalysis, structural/vibrational dynamics, vibronic coupling, coherence, etc.

When semiconducting materials are lying in between two mirrors, a very surprising event happens: light and matter are coupled with each other and thereby generate a new type of quasiparticle possessing both photonic and excitonic characters, which is 'exciton-polariton'. Our ultimate goal is to understand not only how we should properly interrogate polariton with ultrafast spectroscopic tools but also how we can utilize and control it to apply in extensive applications - from optoelectronic devices to quantum information sciences.